"Some of our adCenter advertisers are seeing high cost-per-click (CPC) and spend amounts in their accounts. I will update this post with more information as soon as I have it, but I wanted to let you know that this issue is now resolved and those of you who were overcharged, we're working on a plan to credit your accounts for over-charges as soon as possible," posted a member of the adCenter team.

That's it. No other info from Microsoft so far.

Quipped one poster on ThreadWatch:

"On my own (adCenter) accounts I have phrases that were at ten cents that have been inflated to $79 a click. Even more worrisome is that the bid amounts don't reflect the change. Looks like they have finally out done Google at something!"